Function rustdoc::clean::add_without_unwanted_attributes

fn add_without_unwanted_attributes<'hir>(
    attrs: &mut Vec<(Cow<'hir, Attribute>, Option<DefId>)>,
    new_attrs: &'hir [Attribute],
    is_inline: bool,
    import_parent: Option<DefId>,
)

When inlining items, we merge their attributes (and all the reexports attributes too) with the final reexport. For example:

#[doc(hidden, cfg(feature = "foo"))]
pub struct Foo;

#[doc(cfg(feature = "bar"))]
#[doc(hidden, no_inline)]
pub use Foo as Foo1;

#[doc(inline)]
pub use Foo2 as Bar;

So Bar at the end will have both cfg(feature = "..."). However, we don’t want to merge all attributes so we filter out the following ones:

• doc(inline)
• doc(no_inline)
• doc(hidden)